class_docstr: Test CLAVR-X Reader with Polar files.
docstr: Wrap HDF4 file handler with our own fake handler.
docstr_tok: ["Wrap","HDF4","file","handler","with","our","own","fake","handler","."]
code: def setUp(self):
      """Wrap HDF4 file handler with our own fake handler."""
      from satpy._config import config_search_paths
      from satpy.readers.clavrx import CLAVRXHDF4FileHandler
  
      self.reader_configs = config_search_paths(
          os.path.join("readers", self.yaml_file)
      )
      # http://stackoverflow.com/questions/12219967/how-to-mock-a-base-class-with-python-mock-library
      self.p = mock.patch.object(
          CLAVRXHDF4FileHandler,
          "__bases__",
          (FakeHDF4FileHandlerPolar,),
      )
      self.fake_handler = self.p.start()
      self.p.is_local = True
  
imports: import os
  import unittest
  from unittest import mock
  import dask.array
  import numpy
  import pytest
  import xarray
  from pyresample.geometry import AreaDefinition, SwathDefinition
  from satpy.tests.reader_tests.test_hdf4_utils import FakeHDF4FileHandler
label_desc: Use image node_id 1 for calling the TestCLAVRXReaderPolar obj's underlying member method code with example usage: obj.setUp() without return types